Remove Internal from Module Spec + Update Modules

[alexanderbez]

As a result of #5533, the module pattern of internal no longer serves our needs. This is primarily due to the following:

• Needing access to types.proto. We cannot get access to these message definitions if they're in internal/.
• We've done a great job of testing cleanup (e.g. removing x/mock) so that there is less dependency hell.
• We end up aliasing 90+% of the module anyway.

So the only "win" of internal/ is simply developer UX of not needing to import multiple packages. However, this is moot as any basic IDE should auto-import for you.

• x/bank
• x/crisis
• x/evidence
• x/mint
• x/upgrade

/cc @fedekunze @marbar3778 @jackzampolin @hschoenburg

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